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1. On the adsorption and reactivity of element 114, flerovium

Author

Yakushev, A., Lens, Lotte, Düllmann, Ch. E., Khuyagbaatar, J., Jäger, E., Krier, J., Runke, J., Albers, H. M., Asai, M., Block, M., Despotopulos, J., Di Nitto, Antonio, Eberhardt, K., Forsberg, U., Golubev, P., Götz, M., Götz, Stefan, Haba, H., Harkness-Brennan, L., Herzberg, R.-D., Heßberger, F., Hinde, D., Hübner, A., Judson, D., Kindler, B., Komori, Y., Konki, J., Kratz, J. V., Kurz, N., Laatiaoui, Mustapha, Lahiri, S., Lommel, B., Maiti, M., Mistry, A. K., Mokry, Ch., Moody, K. J., Nagame, Y., Omtvedt, J. P., Papadakis, P., Pershina, V., Rudolph, D., Samiento, L. G., Sato, T. K., Schädel, M., Scharrer, P., Schausten, B., Shaughnessy, D. A., Steiner, J., Thörle-Pospiech, P., Toyoshima, A., Trautmann, N., Tsukada, K., Uusitalo, J., Voss, K.-O., Ward, A., Wegrzecki, M., Wiehl, N., Williams, E., Yakusheva, V., Yakushev, A., Lens, L., Dullmann, C. E., Khuyagbaatar, J., Jager, E., Krier, J., Runke, J., Albers, H. M., Asai, M., Block, M., Despotopulos, J., Di Nitto, A., Eberhardt, K., Forsberg, U., Golubev, P., Gotz, M., Gotz, S., Haba, H., Harkness-Brennan, L., Herzberg, R. -D., Hessberger, F. P., Hinde, D., Hubner, A., Judson, D., Kindler, B., Komori, Y., Konki, J., Kratz, J. V., Kurz, N., Laatiaoui, M., Lahiri, S., Lommel, B., Maiti, M., Mistry, A. K., Mokry, C., Moody, K. J., Nagame, Y., Omtvedt, J. P., Papadakis, P., Pershina, V., Rudolph, D., Samiento, L. G., Sato, T. K., Schadel, M., Scharrer, P., Schausten, B., Shaughnessy, D. A., Steiner, J., Thorle-Pospiech, P., Toyoshima, A., Trautmann, N., Tsukada, K., Uusitalo, J., Voss, K. -O., Ward, A., Wegrzecki, M., Wiehl, N., Williams, E., and Yakusheva, V.

Subjects
superheavy elements, adsorption, ddc:540, General Chemistry, radiochemistry, nuclear chemistry, element 114, recoil separator
Abstract

Frontiers in Chemistry 10, 976635 (2022). doi:10.3389/fchem.2022.976635, Flerovium (Fl, element 114) is the heaviest element chemically studied so far. Todate, its interaction with gold was investigated in two gas-solid chromatographyexperiments, which reported two different types of interaction, however, eachbased on the level of a few registered atoms only. Whereas noble-gas-likeproperties were suggested from the first experiment, the second one pointed ata volatile-metal-like character. Here, we present further experimental data onadsorption studies of Fl on silicon oxide and gold surfaces, accounting for theinhomogeneous nature of the surface, as it was used in the experiment andanalyzed as part of the reported studies. We confirm that Fl is highly volatile andthe least reactive member of group 14. Our experimental observations suggestthat Fl exhibits lower reactivity towards Au than the volatile metal Hg, but higherreactivity than the noble gas Rn., Published by Frontiers Media, Lausanne

Published
2022

2. Spectroscopy along flerovium decay chains. II. Fine structure in odd-A $^{289}Fl$

Author

Cox, D. M., Såmark-Roth, A., Rudolph, D., Sarmiento, L. G., Clark, R. M., Egido, J. L., Golubev, P., Heery, J., Yakushev, A., Åberg, S., Albers, H. M., Albertsson, M., Block, M., Brand, H., Calverley, T., Cantemir, R., Carlsson, B. G., Düllmann, Ch. E., Eberth, J., Fahlander, C., Forsberg, U., Gates, J. M., Giacoppo, F., Götz, Michael, Götz, Stefan, Herzberg, R.-D., Hrabar, Y., Jäger, E., Judson, D., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lens, Lotte, Ljungberg, J., Lommel, B., Louko, J., Meyer, C.-C., Mistry, A., Mokry, C., Papadakis, P., Parr, Edward, Pore, J. L., Ragnarsson, I., Runke, J., Schädel, M., Schaffner, H., Schausten, B., Shaughnessy, D. A., Thörle-Pospiech, P., Trautmann, N., and Uusitalo, J.

Subjects
Superheavy elements, Subatomic Physics, Island of stability, Mean field theory, ddc:530, Alpha decay, Nuclear spectroscopy
Abstract

Physical review / C 107(2), L021301 (2023). doi:10.1103/PhysRevC.107.L021301, Published by APS, Woodbury, NY

Published
2023
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3. Spectroscopy along flerovium decay chains. III. Details on experiment, analysis, $^{282 }Cn$ , and spontaneous fission branches

Author

Såmark-Roth, A., Cox, D. M., Rudolph, D., Sarmiento, L. G., Albertsson, M., Carlsson, B. G., Egido, J. L., Golubev, P., Heery, J., Yakushev, A., Åberg, S., Albers, H. M., Block, M., Brand, H., Calverley, T., Cantemir, R., Clark, R. M., Düllmann, Ch. E., Eberth, J., Fahlander, C., Forsberg, U., Gates, J. M., Giacoppo, F., Götz, Michael, Götz, Stefan, Herzberg, R.-D., Hrabar, Y., Jäger, E., Judson, D., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lens, Lotte, Ljungberg, J., Lommel, B., Louko, J., Meyer, C.-C., Mistry, A., Mokry, C., Papadakis, P., Parr, Edward, Pore, J. L., Ragnarsson, I., Runke, J., Schädel, M., Schaffner, H., Schausten, B., Shaughnessy, D. A., Thörle-Pospiech, P., Trautmann, N., and Uusitalo, J.

Subjects
Superheavy elements, Subatomic Physics, Spontaneous fission, E0 decay, Mean field theory, Alpha decay, ddc:530, Nuclear spectroscopy
Abstract

Physical review / C 107(2), 024301 (2023). doi:10.1103/PhysRevC.107.024301, Published by APS., Woodbury, NY

Published
2023
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4. Spectroscopy along flerovium decay chains. III : Details on experiment, analysis, 282Cn, and spontaneous fission branches

Author

Såmark-Roth, A., Cox, D. M., Rudolph, D., Sarmiento, L. G., Albertsson, M., Carlsson, B. G., Egido, J. L., Golubev, P., Heery, J., Yakushev, A., Åberg, S., Albers, H. M., Block, M., Brand, H., Calverley, T., Cantemir, R., Clark, R. M., Düllmann, Ch. E., Eberth, J., Fahlander, C., Forsberg, U., Gates, J. M., Giacoppo, F., Götz, M., Götz, S., Herzberg, R.-D., Hrabar, Y., Jäger, E., Judson, D., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lens, L., Ljungberg, J., Lommel, B., Louko, J., Meyer, C.-C., Mistry, A., Mokry, C., Papadakis, P., Parr, E., Pore, J. L., Ragnarsson, I., Runke, J., Schädel, M., Schaffner, H., Schausten, B., Shaughnessy, D. A., Thörle-Pospiech, P., Trautmann, N., and Uusitalo, J.

Subjects
ydinfysiikka
Abstract

Flerovium isotopes (element Z=114) were produced in the fusion-evaporation reactions 48Ca+242,244Pu and studied with an upgraded TASISpec decay station placed in the focal plane of the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany. Twenty-nine flerovium decay chains were identified by means of correlated implantation, α decay, and spontaneous fission events. Data analysis aspects and statistical assessments, primarily based on measured rates of various events, which laid the foundation for the comprehensive spectroscopic information on the flerovium decay chains, are presented in detail. Various decay scenarios of an excited state observed in 282Cn are examined in depth with the help of GEANT4 simulations and assessed by predictions of beyond mean-field calculations including triaxial shape degrees of freedom. Previous, revised, and newly derived fission probabilities of even-even superheavy nuclei are compared with various theoretical predictions. peerReviewed

Published
2023

5. Spectroscopy along flerovium decay chains. II : Fine structure in odd-A289Fl

Author

Cox, D. M., Såmark-Roth, A., Rudolph, D., Sarmiento, L. G., Clark, R. M., Egido, J. L., Golubev, P., Heery, J., Yakushev, A., Åberg, S., Albers, H. M., Albertsson, M., Block, M., Brand, H., Calverley, T., Cantemir, R., Carlsson, B. G., Düllmann, Ch. E., Eberth, J., Fahlander, C., Forsberg, U., Gates, J. M., Giacoppo, F., Götz, M., Götz, S., Herzberg, R.-D., Hrabar, Y., Jäger, E., Judson, D., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lens, L., Ljungberg, J., Lommel, B., Louko, J., Meyer, C.-C., Mistry, A., Mokry, C., Papadakis, P., Parr, E., Pore, J. L., Ragnarsson, I., Runke, J., Schädel, M., Schaffner, H., Schausten, B., Shaughnessy, D. A., Thörle-Pospiech, P., Trautmann, N., and Uusitalo, J.

Subjects
ydinfysiikka
Abstract

Fifteen correlated α-decay chains starting from the odd-A superheavy nucleus 289Fl were observed following the fusion-evaporation reaction 48Ca+244Pu. The results call for at least two parallel α-decay sequences starting from at least two different states of 289Fl. This implies that close-lying levels in nuclei along these chains have quite different spin-parity assignments. Further, observed α-electron and α-photon coincidences, as well as the α-decay fine structure along the decay chains, suggest a change in the ground-state spin assignment between 285Cn and 281Ds. Our experimental results, on the excited level structure of the heaviest odd-N nuclei to date, provide a direct testing ground for theory. This is illustrated by comparison with new nuclear structure calculations based on the symmetry-conserving configuration mixing theory. peerReviewed

Published
2023

6. Unveiling the two-proton halo character of 17Ne: Exclusive measurement of quasi-free proton-knockout reactions

Author

Lehr, C., Wamers, F., Aksouh, F., Aksyutina, Yu., ��lvarez-Pol, H., Atar, Leyla, Aumann, Thomas, Beceiro-Novo, S., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Caesar, C., Chartier, M., Chatillon, A., Chulkov, L. V., Cortina-Gil, D., D��az Fern��ndez, P., Emling, Hans, Ershova, Olga, Fraile, L. M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Heil, M., Heine, M., Hoffmann, D. H. H., Holl, M., Johansson, H. T., Jonson, B., Karagiannis, C., Kiselev, O. A., Kratz, J. V., Kulessa, R., Kurz, N., Langer, Christoph, Lantz, M., Le Bleis, T., Lemmon, R., Litvinov, Yu. A., L��her, B., Mahata, K., Marganiec-Gal��zka, J., M��ntz, C., Nilsson, T., Nociforo, C., Ott, W., Panin, V., Paschalis, S., Perea, A., Plag, Ralf, Reifarth, Rene, Richter, A., Riisager, K., Rodriguez-Tajes, C., Rossi, D., Savran, D., Scheit, H., Schrieder, G., Schrock, P., Simon, H., Stroth, J., S��mmerer, K., Tengblad, O., Weick, H., Wimmer, C., Federal Ministry of Education and Research (Germany), Helmholtz International Center for FAIR, Technische Universität Darmstadt, Swedish Research Council, Russian Foundation for Basic Research, Ministerio de Ciencia e Innovación (España), Department of Energy (US), National Science Foundation (US), Aumann, T. [0000-0003-1660-9294], and Aumann, T.

Subjects
Subatomär fysik, Nuclear and High Energy Physics, Física-Modelos matemáticos, Subatomic Physics, Nuclear Theory, Partículas, FOS: Physical sciences, ddc:530, Nuclear Experiment (nucl-ex), Nuclear experiment, Nuclear Experiment
Abstract

7 pags., 5 figs., The proton drip-line nucleus 17Ne is investigated experimentally in order to determine its two-proton halo character. A fully exclusive measurement of the 17Ne(p,2p)16F->15O+p quasi-free one-proton knockout reaction has been performed at GSI at around 500 MeV/nucleon beam energy. All particles resulting from the scattering process have been detected. The relevant reconstructed quantities are the angles of the two protons scattered in quasi-elastic kinematics, the decay of 16F into 15O (including gamma decays from excited states) and a proton, as well as the 15O+p relative-energy spectrum and the 16F momentum distributions. The latter two quantities allow an independent and consistent determination of the ratio of l=0 and l=2 motion of the valence protons in 17Ne. With a resulting relatively small l=0 component of only around 35(3)%, it is concluded that 17Ne exhibits a rather modest halo character only. The quantitative agreement of the two values deduced from the energy spectrum and the momentum distributions supports the theoretical treatment of the calculation of momentum distributions after quasi-free knockout reactions at high energies by taking into account distortions based on the Glauber theory. Moreover, the experimental data allow the separation of valence-proton knockout and knockout from the 15O core. The latter process contributes with 11.8(3.1) mb around 40% to the total proton-knockout cross section of 30.3(2.3) mb, which explains previously reported contradicting conclusions derived from inclusive cross sections., This work is supported by the German Federal Ministry for Education and Research (BMBF) under contract No. 05P15RDFN1, the ExtreMe Matter Institute (EMMI), HIC for FAIR, and the GSI- TU Darmstadt cooperation agreement. Financial support from the Swedish Research Council, from the Russian Foundation for Ba- sic Research (RFBR Grant 12-02-01115-a), and from the Spanish grants from MICINN AEI FPA2017-87568-P, PGC2018-0099746-B- C21, FPA2015-64969-P, PID2019-104390GB-I00, RTI2018-098868- B-100, and Maria de Maeztu Units of excellence MDM-2016-0692 are also acknowledged. One of us (B. J.) is a Helmholtz Interna- tional Fellow. C.A.B. acknowledges support by the U.S. DOE grant DE-FG02-08ER41533 and the U.S. NSF Grant No. 1415656

Published
2022

7. Search for Electron-Capture Delayed Fission in the New Isotope Md 244

Author

Khuyagbaatar J., Albers H. M., Block M., Brand H., Cantemir R. A., Di Nitto A., Dullmann C. E., Gotz M., Gotz S., Hessberger F. P., Jager E., Kindler B., Kratz J. V., Krier J., Kurz N., Lommel B., Lens L., Mistry A., Schausten B., Uusitalo J., Yakushev A., Khuyagbaatar, J., Albers, H. M., Block, M., Brand, H., Cantemir, R. A., Di Nitto, A., Dullmann, C. E., Gotz, M., Gotz, S., Hessberger, F. P., Jager, E., Kindler, B., Kratz, J. V., Krier, J., Kurz, N., Lommel, B., Lens, L., Mistry, A., Schausten, B., Uusitalo, J., and Yakushev, A.

Abstract

The electron-capture decay followed by a prompt fission process was searched for in the hitherto unknown most neutron-deficient Md isotope with mass number 244. Alpha decay with α-particle energies of 8.73-8.86 MeV and with a half-life of 0.30-0.09+0.19 s was assigned to Md244. No fission event with a similar half-life potentially originating from spontaneous fissioning of the short-lived electron-capture decay daughter Fm244 was observed, which results in an upper limit of 0.14 for the electron-capture branching of Md244. Two groups of fission events with half-lives of 0.9-0.3+0.6 ms and 5-2+3 ms were observed. The 0.9-0.3+0.6 ms activity was assigned to originate from the decay of Md245. The origin of eight fission events resulting in a half-life of 5-2+3 ms could not be unambiguously identified within the present data while the possible explanation has to invoke previously unseen physics cases.

Published
2020

8. Spectroscopy along Flerovium Decay Chains: Discovery of ^{280}Ds and an Excited State in ^{282}Cn

Author

Såmark-Roth, A., Cox, D. M., Rudolph, D., Sarmiento, L. G., Carlsson, B. G., Egido, J. L., Golubev, P., Heery, J., Yakushev, A., Åberg, S., Albers, H. M., Albertsson, M., Block, M., Brand, H., Calverley, T., Cantemir, R., Clark, R. M., Düllmann, Ch. E., Eberth, J., Fahlander, C., Forsberg, U., Gates, J. M., Giacoppo, F., Götz, M., Götz, S., Herzberg, R.-D., Hrabar, Y., Jäger, E., Judson, D., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lens, L., Ljungberg, J., Lommel, B., Louko, J., Meyer, C.-C., Mistry, A., Mokry, C., Papadakis, P., Parr, E., Pore, J. L., Ragnarsson, I., Runke, J., Schädel, M., Schaffner, H., Schausten, B., Shaughnessy, D. A., Thörle-Pospiech, P., Trautmann, N., and Uusitalo, J.

Subjects
General Physics, Engineering, Superheavy elements, Subatomic Physics, Island of stability, Physical Sciences, Mean field theory, Alpha decay, ddc:530, Mathematical Sciences, Nuclear spectroscopy
Abstract

Physical review letters 126(3), 032503 (2021). doi:10.1103/PhysRevLett.126.032503, Published by APS, College Park, Md.

Published
2021

9. Fusion reaction Ca 48 + Bk 249 leading to formation of the element Ts (Z=117)

Author

Khuyagbaatar J., Yakushev A., Dullmann Ch. E., Ackermann D., Andersson L. -L., Asai M., Block M., Boll R. A., Brand H., Cox D. M., Dasgupta M., Derkx X., Di Nitto A., Eberhardt K., Even J., Evers M., Fahlander C., Forsberg U., Gates J. M., Gharibyan N., Golubev P., Gregorich K. E., Hamilton J. H., Hartmann W., Herzberg R. -D., Hessberger F. P., Hinde D. J., Hoffmann J., Hollinger R., Hubner A., Jager E., Kindler B., Kratz J. V., Krier J., Kurz N., Laatiaoui M., Lahiri S., Lang R., Lommel B., Maiti M., Miernik K., Minami S., Mistry A., Mokry C., Nitsche H., Omtvedt J. P., Pang G. K., Papadakis P., Renisch D., Roberto J., Rudolph D., Runke J., Rykaczewski K. P., Sarmiento L. G., Schadel M., Schausten B., Semchenkov A., Shaughnessy D. A., Steinegger P., Steiner J., Tereshatov E. E., Thorle-Pospiech P., Tinschert K., Torres De Heidenreich T., Trautmann N., Turler A., Uusitalo J., Ward D. E., Wegrzecki M., Wiehl N., Van Cleve S. M., Yakusheva V., Khuyagbaatar, J., Yakushev, A., Dullmann, Ch. E., Ackermann, D., Andersson, L. -L., Asai, M., Block, M., Boll, R. A., Brand, H., Cox, D. M., Dasgupta, M., Derkx, X., Di Nitto, A., Eberhardt, K., Even, J., Evers, M., Fahlander, C., Forsberg, U., Gates, J. M., Gharibyan, N., Golubev, P., Gregorich, K. E., Hamilton, J. H., Hartmann, W., Herzberg, R. -D., Hessberger, F. P., Hinde, D. J., Hoffmann, J., Hollinger, R., Hubner, A., Jager, E., Kindler, B., Kratz, J. V., Krier, J., Kurz, N., Laatiaoui, M., Lahiri, S., Lang, R., Lommel, B., Maiti, M., Miernik, K., Minami, S., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Pang, G. K., Papadakis, P., Renisch, D., Roberto, J., Rudolph, D., Runke, J., Rykaczewski, K. P., Sarmiento, L. G., Schadel, M., Schausten, B., Semchenkov, A., Shaughnessy, D. A., Steinegger, P., Steiner, J., Tereshatov, E. E., Thorle-Pospiech, P., Tinschert, K., Torres De Heidenreich, T., Trautmann, N., Turler, A., Uusitalo, J., Ward, D. E., Wegrzecki, M., Wiehl, N., Van Cleve, S. M., and Yakusheva, V.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

The heaviest currently known nuclei, which have up to 118 protons, have been produced in Ca48 induced reactions with actinide targets. Among them, the element tennessine (Ts), which has 117 protons, has been synthesized by fusing Ca48 with the radioactive target Bk249, which has a half-life of 327 d. The experiment was performed at the gas-filled recoil separator TASCA. Two long and two short α decay chains were observed. The long chains were attributed to the decay of Ts294. The possible origin of the short-decay chains is discussed in comparison with the known experimental data. They are found to fit with the decay chain patterns attributed to Ts293. The present experimental results confirm the previous findings at the Dubna Gas-Filled Recoil Separator on the decay chains originating from the nuclei assigned to Ts.

Published
2019

10. 117番元素Ts合成のための48Ca+249Bk融合反応

Author

Khuyagbaatar, J., Yakushev, A., Düllmann, Ch E., Ackermann, D., Andersson, L. L., Asai, M., Block, M., Boll, R. A., Brand, H., Cox, D. M., Dasgupta, M., Derkx, X., Di Nitto, A., Eberhardt, K., Even, J., Evers, M., Fahlander, C., Forsberg, U., Gates, J. M., Gharibyan, N., Golubev, P., Gregorich, K. E., Hamilton, J. H., Hartmann, W., Herzberg, R. D., Heßberger, F. P., Hinde, D. J., Hoffmann, J., Hollinger, R., Hübner, A., Jäger, E., Kindler, B., Kratz, J. V., Krier, J., Kurz, N., Laatiaoui, M., Lahiri, S., Lang, R., Lommel, B., Maiti, M., Miernik, K., Minami, S., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Pang, G. K., Papadakis, P., Renisch, D., Roberto, J., Rudolph, D., Runke, J., Rykaczewski, K. P., Sarmiento, L. G., Schädel, M., Schausten, B., Semchenkov, A., Shaughnessy, D. A., Steinegger, P., Steiner, J., Tereshatov, E. E., Thörle-Pospiech, P., Tinschert, K., Torres De Heidenreich, T., Trautmann, N., Türler, A., Uusitalo, J., Ward, D. E., Wegrzecki, M., Wiehl, N., Van Cleve, S. M., and Yakusheva, V.

Subjects
gas-filled separator, superheavy elements, element 117 (Ts), alpha decay, Subatomic Physics, Nuclear Theory, low and intermediate energy heavy-ion reactions, ydinfysiikka, Nuclear Experiment, nuclear structure and decays
Abstract

We have performed an experiment to synthesize the element 117 (Ts) with the $^{48}$Ca+$^{249}$Bk fusion reaction. Four $\alpha$-decay chains attributed to the element 117 were observed. Two of them were long decay chains which can be assigned to the one originating from the $\alpha$ decay of $^{294}$Ts. The other two were short decay chains which are consistent with the one originating from the $\alpha$ decay of $^{293}$Ts. We have compared the present results with the literature data, and found that our present results mostly confirmed the literature data, leading to the firm confirmation of the synthesis of the element 117., $^{48}$Ca+$^{249}$B融合反応を用いて117番元素(Ts)合成実験を行い、117番元素に起因すると思われる4つの$\alpha$崩壊連鎖を観測した。うち2つは長い崩壊連鎖で、$^{294}$Tsの$\alpha$崩壊に起因するものと同定された。他の2つは短い崩壊連鎖で、$^{293}$Tsの$\alpha$崩壊に起因すると考えると矛盾しない。今回の結果と過去の文献値を比較したところ、今回の我々の結果は過去の文献値をほぼ再現し、117番元素合成の事実を強く再確認する結果となった。

Published
2019

11. 超アクチノイド元素Zgeq104の溶液化学的研究

Author

Nagame, Yuichiro, Kratz, J. V., and Sch\\\'adel, M.

Abstract

Recent studies of the chemical separation and characterization experiments of the first three transactinide elements, rutherfordium (Rf), dubnium (Db), and seaborgium (Sg), conducted atom-at-a-time in liquid phases, are reviewed. A short description on experimental techniques based on partition methods, specifically automated rapid chemical separation systems, is also given. A newly developed experimental approach to investigate single atoms of the heaviest elements with an electrochemical method is introduced. Perspectives for liquid-phase chemistry experiments on heavier elements are briefly discussed.

Published
2015

12. Low-lying states in 219Ra and 215Rn : Sampling microsecond α-decaying nuclei

Author

Såmark-Roth, A., Sarmiento, L. G., Rudolph, D., Ljungberg, J., Carlsson, B. G., Fahlander, C., Forsberg, U., Golubev, P., Ragnarsson, I., Ackermann, D., Andersson, L. L., Block, M., Brand, H., Cox, D. M., Di Nitto, A., Düllmann, Ch E., Eberhardt, K., Even, J., Gates, J. M., Gerl, J., Gregorich, K. E., Gross, C. J., Herzberg, R. D., Heßberger, F. P., Jäger, E., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Omtvedt, J. P., Papadakis, P., Runke, J., Rykaczewski, K., Schädel, M., Schaffner, H., Schausten, B., Thörle-Pospiech, P., Trautmann, N., Torres, T., Türler, A., Ward, A., Wiehl, N., and Yakushev, A.

Subjects
alpha decay, gamma-ray spectroscopy, nuclear shell model, pulse shape analysis, Subatomic Physics, half life, Nilsson-Strutinsky calculations
Abstract

Short-lived α-decaying nuclei "northeast" of 208Pb in the chart of nuclides were studied using the reaction 48Ca+243Am with the decay station TASISpec at TASCA, GSI Darmstadt. Decay energies and times from pile-up events were extracted with a tailor-made pulse-shape analysis routine and specific α-decay chains were identified in a correlation analysis. Decay chains starting with the even-even 220Ra and its odd-A neighbors, 219Fr, and 219,221Ra, with a focus on the 219Ra→215Rn decay, were studied by means of α-γ spectroscopy. A revised α-decay scheme of 219Ra is proposed, including a new decay branch from a previously not considered isomeric state at 17 keV excitation energy. Conclusions on nuclear structure are drawn from the experimental data, aided by Geant4 simulations and a discussion on theoretical calculations.

Published
2018

13. Study of non-fusion products in the 50Ti+249Cf reaction

Author

Di Nitto, A., Khuyagbaatar, J., Ackermann, D., Andersson, L.-L., Badura, E., Block, M., Brand, H., Conrad, I., Cox, D. M., Düllmann, Ch. E., Dvorak, J., Eberhardt, K., Ellison, P. A., Esker, N. E., Even, J., Fahlander, C., Forsberg, U., Gates, J. M., Golubev, P., Gothe, O., Gregorich, K. E., Hartmann, W., Herzberg, R. D., Heßberger, F. P., Hoffmann, J., Hollinger, R., Hübner, A., Jäger, E., Kindler, B., Klein, S., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lahiri, S., Lommel, B., Maiti, M., Mändl, R., Merchán, E., Minami, S., Mistry, A. K., Mokry, C., Nitsche, H., Omtvedt, J. P., Pang, G. K., Renisch, D., Rudolph, D., Runke, J., Sarmiento, L. G., Schädel, M., and Research unit Nuclear & Hadron Physics

Subjects
COLLISIONS, PROBABILITY, CA-48+CM-248, production of radioactive nuclei, U-238, ELEMENTS, ISOTOPES, MULTINUCLEON TRANSFER-REACTIONS, HEAVY, Nuclear Experiment, FISSION, BARRIER
Abstract

The isotopic distribution of nuclei produced in the 50Ti + 249Cf reaction has been studied at the gas-filled recoil separator TASCA at GSI Darmstadt, which separates ions according to differences in magnetic rigidity. The bombardment was performed at an energy around the Bass barrier and with the TASCA magnetic fields set for collecting fusion-evaporation reaction products. Fifty-three isotopes located “north-east” of 208Pb were identified as recoiling products formed in non-fusion channels of the reaction. These recoils were implanted with energies in two distinct ranges; besides one with higher energy, a significant low-energy contribution was identified. The latter observation was not expected to occur according to kinematics of the known types of reactions, namely quasi-elastic, multi-nucleon transfer, deep-inelastic collisions or quasifission. The present observations are discussed within the framework of two-body kinematics passing through the formation of a composite system.

Published
2018

14. Study of non-fusion products in the 50Ti + 249Cf reaction

Author

Di Nitto, Antonio, Khuyagbaatar, J., Ackermann, Dieter, Andersson, L.-L., Badura, E., Block, M., Brand, H., Conrad, I., Cox, D. M., Düllmann, Christoph Emanuel, Dvorak, Jan, Eberhardt, K., Ellison, P. A., Esker, N. E., Even, Julia, Fahlander, C., Forsberg, U., Gates, J. M., Golubev, P., Gothe, O., Gregorich, K. E., Hartmann, W., Herzberg, R. D., Heßberger, F., Hoffmann, J., Hollinger, R., Hübner, A., Jäger, E., Kindler, B., Klein, S., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lahiri, S., Lommel, B., Maiti, M., Mändl, R., Merchán, E., Minami, S., Mistry, A. K., Mokry, C., Nitsche, H., Omtvedt, J. P., Pang, G. K., Renisch, D., Rudolph, D., Runke, J., Sarmiento, L. G., Schädel, M., Schaffner, H., Schausten, B., Semchenkov, A., Steiner, J., Thörle-Pospiech, P., Trautmann, N., Türler, A., Uusitalo, J., Ward, D., Wegrzecki, M., Wieczorek, P., Wiehl, N., Yakushev, A., and Yakusheva, V.

Subjects
ydinreaktiot, production of radioactive nuclei, ddc:530, multi-nucleon transfer reactions, quasifission, Nuclear Experiment, α decay, ydinfysiikka
Abstract

Physics letters / B B 784, 199 - 205 (2018). doi:10.1016/j.physletb.2018.07.058, Published by North-Holland Publ., Amsterdam

Published
2018

16. Recoil-α-fission and recoil-α-α-fission events observed in the reaction 48Ca + 243Am

Author

Forsberg, U., Rudolph, D., Andersson, L. -L., Nitto, A. Di, Düllmann, Ch E., Gates, J. M., Golubev, P., Gregorich, K. E., Gross, C. J., Herzberg, R. -D., Hessberger, F. P., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Sarmiento, L. G., Schädel, M., Yakushev, A., Åberg, S., Ackermann, D., Block, M., Brand, H., Carlsson, B. G., Cox, D., Derkx, X., Dobaczewski, Jacek Jan, Eberhardt, K., Even, J., Fahlander, C., Gerl, J., Jäger, E., Kindler, B., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Nazarewicz, W., Nitsche, H., Omtvedt, J. P., Papadakis, P., Ragnarsson, I., Runke, J., Schaffner, H., Schausten, B., Shi, Y., Thörle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Türler, A., Ward, A., Ward, D. E., and Wiehl, N.

Subjects
Quantum Physics, Uup, alpha decay, Superheavy elements, Spontaneous fission, Molecular, nucl-ex, Nuclear & Particles Physics, Atomic, Particle and Plasma Physics, Nuclear, Element 115, Nuclear Experiment, Astronomical and Space Sciences
Abstract

Products of the fusion-evaporation reaction 48Ca + 243Am were studied with the TASISpec set-up at the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany. Amongst the detected thirty correlated α-decay chains associated with the production of element Z=115, two recoil-α-fission and five recoil-α-α-fission events were observed. The latter five chains are similar to four such events reported from experiments performed at the Dubna gas-filled separator, and three such events reported from an experiment at the Berkeley gas-filled separator. The four chains observed at the Dubna gas-filled separator were assigned to start from the 2n-evaporation channel 289115 due to the fact that these recoil-α-α-fission events were observed only at low excitation energies. Contrary to this interpretation, we suggest that some of these recoil-α-α-fission decay chains, as well as some of the recoil-α-α-fission and recoil-α-fission decay chains reported from Berkeley and in this article, start from the 3n-evaporation channel 288115.

Published
2016

17. Recoil-alpha-fission and recoil-alpha-alpha-fission events observed in the reaction Ca-48+Am-243

Author

Forsberg, U., Rudolph, D., Andersson, L. -L., Di Nitto, A., D��llmann, Ch. E., Gates, J. M., Golubev, P., Gregorich, K. E., Gross, C. J., Herzberg, R. -D., Hessberger, F. P., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Sarmiento, L. G., Sch��del, M., Yakushev, A., ��berg, S., Ackermann, D., Block, M., Brand, H., Carlsson, B. G., Cox, D., Derkx, X., Dobaczewski, J., Eberhardt, K., Even, J., Fahlander, C., Gerl, J., J��ger, E., Kindler, B., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Nazarewicz, W., Nitsche, H., Omtvedt, J. P., Papadakis, P., Ragnarsson, I., Runke, J., Schaffner, H., Schausten, B., Shi, Y., Th��rle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., T��rler, A., Ward, A., Ward, D. E., Wiehl, N., and Research unit Nuclear & Hadron Physics

Subjects
SPECTROSCOPY, Uup, alpha decay, NUCLEI, Superheavy elements, Spontaneous fission, FOS: Physical sciences, SEPARATOR, nucl-ex, HEAVIEST ELEMENTS, CHEMISTRY, SIMULATION, TASCA, Element 115, Nuclear Experiment (nucl-ex), HEAVY, Nuclear Experiment, 115 DECAY CHAINS
Abstract

Products of the fusion-evaporation reaction Ca-48 + Am-243 were studied with the TASISpec set-up at the gas-filled separator TASCA at the GSI Helmholtzzentrum f\"ur Schwerionenforschung. Amongst the detected thirty correlated alpha-decay chains associated with the production of element Z=115, two recoil-alpha-fission and five recoil-alpha-alpha-fission events were observed. The latter are similar to four such events reported from experiments performed at the Dubna gas-filled separator. Contrary to their interpretation, we propose an alternative view, namely to assign eight of these eleven decay chains of recoil-alpha(-alpha)-fission type to start from the 3n-evaporation channel 115-288. The other three decay chains remain viable candidates for the 2n-evaporation channel 115-289., Comment: 15 pages. Article: 9 pages, 3 tables, 3 figures. Supplemental material: 6 pages, 7 tables, 1 figure. Submitted to PRC

Published
2016

18. Ca 48 + Bk 249 fusion reaction leading to element Z=117: Long-lived α -decaying Db 270 and discovery of Lr 266

Author

Khuyagbaatar J., Yakushev A., Dullmann Ch. E., Ackermann D., Andersson L. -L., Asai M., Block M., Boll R. A., Brand H., Cox D. M., Dasgupta M., Derkx X., Di Nitto A., Eberhardt K., Even J., Evers M., Fahlander C., Forsberg U., Gates J. M., Gharibyan N., Golubev P., Gregorich K. E., Hamilton J. H., Hartmann W., Herzberg R. -D., Hessberger F. P., Hinde D. J., Hoffmann J., Hollinger R., Hubner A., Jager E., Kindler B., Kratz J. V., Krier J., Kurz N., Laatiaoui M., Lahiri S., Lang R., Lommel B., Maiti M., Miernik K., Minami S., Mistry A., Mokry C., Nitsche H., Omtvedt J. P., Pang G. K., Papadakis P., Renisch D., Roberto J., Rudolph D., Runke J., Rykaczewski K. P., Sarmiento L. G., Schadel M., Schausten B., Semchenkov A., Shaughnessy D. A., Steinegger P., Steiner J., Tereshatov E. E., Thorle-Pospiech P., Tinschert K., Torres De Heidenreich T., Trautmann N., Turler A., Uusitalo J., Ward D. E., Wegrzecki M., Wiehl N., Van Cleve S. M., Yakusheva V., Khuyagbaatar, J., Yakushev, A., Dullmann, Ch. E., Ackermann, D., Andersson, L. -L., Asai, M., Block, M., Boll, R. A., Brand, H., Cox, D. M., Dasgupta, M., Derkx, X., Di Nitto, A., Eberhardt, K., Even, J., Evers, M., Fahlander, C., Forsberg, U., Gates, J. M., Gharibyan, N., Golubev, P., Gregorich, K. E., Hamilton, J. H., Hartmann, W., Herzberg, R. -D., Hessberger, F. P., Hinde, D. J., Hoffmann, J., Hollinger, R., Hubner, A., Jager, E., Kindler, B., Kratz, J. V., Krier, J., Kurz, N., Laatiaoui, M., Lahiri, S., Lang, R., Lommel, B., Maiti, M., Miernik, K., Minami, S., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Pang, G. K., Papadakis, P., Renisch, D., Roberto, J., Rudolph, D., Runke, J., Rykaczewski, K. P., Sarmiento, L. G., Schadel, M., Schausten, B., Semchenkov, A., Shaughnessy, D. A., Steinegger, P., Steiner, J., Tereshatov, E. E., Thorle-Pospiech, P., Tinschert, K., Torres De Heidenreich, T., Trautmann, N., Turler, A., Uusitalo, J., Ward, D. E., Wegrzecki, M., Wiehl, N., Van Cleve, S. M., and Yakusheva, V.

Abstract

The superheavy element with atomic number Z=117 was produced as an evaporation residue in the (48)Ca+(249)Bk fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. The radioactive decay of evaporation residues and their α-decay products was studied using a detection setup that allowed measuring decays of single atomic nuclei with half-lives between sub-μs and a few days. Two decay chains comprising seven α decays and a spontaneous fission each were identified and are assigned to the isotope (294)117 and its decay products. A hitherto unknown α-decay branch in (270)Db (Z = 105) was observed, which populated the new isotope (266)Lr (Z = 103). The identification of the long-lived (T(1/2) = 1.0(-0.4)(+1.9) h) α-emitter (270)Db marks an important step towards the observation of even more long-lived nuclei of superheavy elements located on an "island of stability."

Published
2014

19. Experimental study of the O-15(2p, gamma) Ne-17 cross section by Coulomb Dissociation for the rp process

Author

Marganiec, J., Wamers, F., Aksouh, F., Aksyutina, Y., Pol, H. Alvarez, Aumann, T., Beceiro, S., Bertulani, Carlos, Boretzky, K., Borge, M. J. G., Chartier, M., Chatillon, A., Chulkov, L., Cortina-Gil, D., Egorova, I., Emling, H., Ershova, O., Forssén, C, Fraile, L. M., Fynbo, H., Galaviz, D., Geissel, H., Grigorenko, L., Heil, M., Hoffmann, D. H. H., Hoffmann, J., Johansson, H., Jonson, B., Karakoc, M., Karagiannis, C., Kiselev, O.A., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C, Lantz, M., Larsson, K., Le Bleis, T., Lemmon, R., Litvinov, Yu. A., Mahata, K., Muentz, C., Nilsson, T., Nociforo, C., Nyman, G., Ott, W., Panin, V., Parfenova, Yu, Paschalis, S., Perea, A., Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodriguez-Tajes, C., Rossi, D., Schrieder, G., Shulgina, N., Simon, H., Stroth, J., Suemmerer, K., Taylor, J., Tengblad, O., Tengborn, E., Weick, H., Wiescher, M., Wimmer, C., and Zhukov, M.

Subjects
CAPTURE, Nuclear Experiment, RADII
Abstract

The time-reversed reaction O-15(2p, gamma) Ne-17 has been studied by the Coulomb dissociation technique. Secondary 17Ne ion beams at 500 AMeV have been produced by fragmentation reactions of Ne-20 in a beryllium production target and dissociated on a secondary Pb target. The incoming beam and the reaction products have been identified with the kinematically complete LAND-(RB)-B-3 experimental setup at GSI. The excitation energy prior to decay has been reconstructed by using the invariant-mass method. The preliminary differential and integral Coulomb Dissociation cross sections (sigma(Coul)) have been calculated, which provide a photoabsorption (sigma(photo)) and a radiative capture cross section (sigma(cap)). Additionally, important information about the nuclear structure of the Ne-17 nucleus will be obtained. The analysis is in progress.

Published
2016

20. New Short-Lived Isotope ^{221}U and the Mass Surface Near N=126

Author

Khuyagbaatar, J., Yakushev, A., Düllmann, Ch. E., Ackermann, D., Andersson, L.-L., Block, M., Brand, H., Cox, D. M., Even, J., Forsberg, Ulrika, Golubev, Pavel, Hartmann, W., Herzberg, R.-D., Heßberger, F. P., Hoffmann, J., Hübner, A., Jäger, E., Jeppsson, J., Kindler, B., Kratz, J. V., Krier, J., Kurz, N., Lommel, B., Maiti, M., Minami, S., Mistry, A. K., Mrosek, Ch. M., Pysmenetska, I., Rudolph, Dirk, Sarmiento, Luis, Schaffner, H., Schädel, M., Schausten, B., Steiner, J., De Heidenreich, T. Torres, Uusitalo, J., Wegrzecki, M., Wiehl, N., and Yakusheva, V.

Subjects
Shell Structure, Heavy Elements Shell Structure Sampling Electronics, Heavy Elements, Sampling Electronics, Subatomic Physics
Abstract

Two short-lived isotopes ^{221}U and ^{222}U were produced as evaporation residues in the fusion reaction ^{50}Ti+^{176}Yb at the gas-filled recoil separator TASCA. An α decay with an energy of E_{α}=9.31(5) MeV and half-life T_{1/2}=4.7(7) μs was attributed to ^{222}U. The new isotope ^{221}U was identified in α-decay chains starting with E_{α}=9.71(5) MeV and T_{1/2}=0.66(14) μs leading to known daughters. Synthesis and detection of these unstable heavy nuclei and their descendants were achieved thanks to a fast data readout system. The evolution of the N=126 shell closure and its influence on the stability of uranium isotopes are discussed within the framework of α-decay reduced width.

Published
2015

21. Sorption on mineral surfaces

Author

Banik, N. L., Geckeis, H., Heberling, F., Lützenkirchen, J., Marquardt, C., Marsac, R., Rabung, T., Schäfer, T., Schild, D., Schnurr, A., Buda, R. A., Kratz, J. V., Preocanin, T., Kallay, N., and Eng, P. J.

Subjects
Technology, ddc:600
Published
2015

22. Recoil-alpha-fission and Recoil-alpha-alpha-fission Chains Stemming from Element 115

Author

Rudolph, D., Forsberg, U., Andersson, L., Block, M., Brand, H., Crox, D., Derkx, X., Di Nitto, A., Eberhardt, K., Even, J., Fahlander, C., Gates, J. M., Düllmann, C. E., Gerl, J., Gregorich, E. K., Gross, C. J., Herzberg, R., Jäger, E., Kindler, B., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Golubev, P., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Papadakis, P., Runke, J., Rykaczewski, K., Schädel, M., Schaffner, H., Schausten, B., Hessberger, F., Thörle-Pospiech, P., Torres de Heidenreich, T., Traut, T., Trautmann, N., Thürler, A., Ward, A., Wiehl, N., Khuyagbaatar, J., Kratz, J. V., Sarmiento, L. G., Yakushev, A., and Ackermann, D.

Subjects
Physics, Subatomic Physics
Abstract

GSI Scientific Report 2014 - GSI Report 2015-1

Published
2015

23. Chemical Study of Fl, Cn, their Lighter Homologs and Rn at TASCA

Author

Yakushev, A., Lens, L., Di Nitto, A., Eberhardt, K., Even, J., Fan, F., Golubev, P., Haba, H., Hartmann, Willi, Herzberg, R., Hessberger, F., Hoffmann, J., Düllmann, C. E., Hübner, A., Jäger, E., Jadambaa, K., Kindler, B., Kratz, J. V., Krier, J., Kurz, N., Lahiri, S., Lommel, B., Maiti, M., Ackermann, D., Mistry, A., Mokry, C., Moody, K., Nagame, Y., Omtvedt, J. P., Papadakis, P., Qin, Z., Rudolph, D., Runke, J., Rusanov, I., Asai, M., Sarmiento, L. G., Sato, T., Schädel, M., Scharrer, P., Schausten, B., Shaughnessy, D., Steiner, J., Thörle-Pospiech, P., Trautmann, N., Uusitalo, J., Ballof, J., Ward, D., Wegrzecki, M., Whiel, N., Yakusheva, V., Block, M., Brand, H., Cox, D. M., and Despotopulos, J.

Subjects
Physics, Subatomic Physics
Abstract

GSI Scientific Report 2014 - GSI Report 2015-1

Published
2015

24. Online chemical study of Pb, Hg and Tl on SiO$_2$ and Au surfaces at TASCA

Author

Lens, L., Ballof, J., Hübner, A., Jäger, E., Jadambaa, Khuyagbaatar, Kindler, B., Kratz, J. V., Krier, J., Kurz, N., Lommel, B., Mokry, C., Runke, J., Yakushev, A., Scharrer, P., Schausten, B., Steiner, J., Thörle-Pospiech, P., Wegrzecki, M., Wiehl, N., Yakusheva, V., Düllmann, C. E., Brand, H., Derkx, X., Di Nitto, A., Even, J., Hartmann, W., and Hessberger, Fritz-Peter

Subjects
Physics
Abstract

GSI Scientific Report 2014 - GSI Report 2015-1

Published
2015
Full Text
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25. Synthesis and chemical investigation of Sg(CO)$_6$

Author

Even, J., Yakushev, A., Düllmann, C. E., Haba, H., Asai, M., Sato, T. K., Brand, H., Di Nitto, A., Eichler, R., Fan, F. L., Hartmann, Willi, Huang, M., Jäger, E., Kaji, D., Kanaya, J., Kaneya, Y., Khuyagbaatar, J., Kindler, B., Kratz, J. V., Krier, J., Kudou, Y., Kurz, N., Lommel, B., Miyashita, S., Morimoto, K., Morita, K., Murakami, M., Nagame, Y., Nietsche, H., Ooe, K., Qin, Z., Schädel, M., Steiner, J., Sumita, T., Takeyama, M., Tanaka, K., Toyoshima, A., Tsukada, K., Türler, A., Usoltsev, I., Wakabayashi, Y., Wang, Y., Wiehl, N., and Yamaki, S.

Subjects
Physics
Abstract

GSI Scientific Report 2014 - GSI Report 2015-1

Published
2015

26. Measurement of the Dipole Polarizability of $^{68}Ni$

Author

Rossi, D. M., Adrich, P., Aksouh, F., Alvarez-Pol, H., Benlliure, J., Aumann, T., Böhmer, M., Boretzky, K., Casarejos, E., Chartier, M., Chatillon, A., Cortina-Gil, D., Datta Pramanik, U., Emling, H., Ershova, O., Fernandez-Dominguez, B., Geissel, H., Gorska, M., Heil, M., Johansson, H. T., Junghans, A., Kelic-Heil, A., Kiselev, O., Klimkiewicz, A., Kratz, J. V., Krücken, R., Kurz, N., Labiche, M., Le Bleis, T., Lemmon, R., Litvinov, Yury, Mahata, K., Maierbeck, P., Movsesyan, A., Nilsson, T., Nociforo, C., Palit, R., Paschalis, S., Plag, R., Reifarth, R., Savran, D., Scheit, H., Simon, H., Sümmerer, K., Wagner, A., Walus, W., Weick, H., and Winkler, M.

Subjects
Physics
Abstract

GSI Scientific Report 2013 - GSI Report 2014-1

Published
2014

27. Element 115 studied with TASISpec

Author

Rudolph, D., Forsberg, U., Gross, C. J., Herzberg, R.-D., Heßberger, F., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Schädel, M., Aberg, S., Ackermann, D., Block, M., Golubev, P., Brand, H., Carlsson, B. G., Cox, D., Derkx, X., Eberhardt, K., Even, J., Fahlander, C., Gerl, J., Jäger, E., Kindler, B., Sarmiento, L. G., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Papadakis, P., Ragnarsson, I., Yakushev, A., Runke, J., Schaffner, H., Schausten, B., Thörle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Türler, A., Ward, A., Ward, D. E., Andersson, L.-L., Wiehl, N., Di Nitto, A., Düllmann, C. E., Gates, J. M., and Gregorich, K. E.

Subjects
Physics
Abstract

GSI Scientific Report 2013 - GSI Report 2014-1

Published
2014
Full Text
View/download PDF

28. 48Ca+249Bk Fusion Reaction Leading to Element Z=117: Long-Lived α-Decaying 270Db and Discovery of 266Lr

Author

Khuyagbaatar, J., Yakushev, A., Düllmann, Ch. E., Ackermann, D., Andersson, L.-L., Asai, M., Block, M., Boll, R. A., Brand, H., Cox, D. M., Dasgupta, M., Derkx, X., Di Nitto, A., Eberhardt, K., Even, J., Evers, M., Fahlander, Claes, Forsberg, Ulrika, Gates, J. M., Gharibyan, N., Golubev, Pavel, Gregorich, K. E., Hamilton, J. H., Hartmann, W., Herzberg, R.-D., Heßberger, F. P., Hinde, D. J., Hoffmann, J., Hollinger, R., Hübner, A., Jäger, E., Kindler, B., Kratz, J. V., Krier, J., Kurz, N., Laatiaoui, M., Lahiri, S., Lang, R., Lommel, B., Maiti, M., Miernik, K., Minami, S., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Pang, G. K., Papadakis, P., Renisch, D., Roberto, J., Rudolph, Dirk, Runke, J., Rykaczewski, K. P., Sarmiento, Luis, Schädel, M., Schausten, B., Semchenkov, A., Shaughnessy, D. A., Steinegger, P., Steiner, J., Tereshatov, E. E., Thörle-Pospiech, P., Tinschert, K., Torres De Heidenreich, T., Trautmann, N., Türler, A., Uusitalo, J., Ward, D. E., Wegrzecki, M., Wiehl, N., Van Cleve, S. M., and Yakusheva, V.

Subjects
superheavy elements, element 117, Subatomic Physics, alpha-decay
Abstract

The superheavy element with atomic number Z=117 was produced as an evaporation residue in the (48)Ca+(249)Bk fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. The radioactive decay of evaporation residues and their α-decay products was studied using a detection setup that allowed measuring decays of single atomic nuclei with half-lives between sub-μs and a few days. Two decay chains comprising seven α decays and a spontaneous fission each were identified and are assigned to the isotope (294)117 and its decay products. A hitherto unknown α-decay branch in (270)Db (Z = 105) was observed, which populated the new isotope (266)Lr (Z = 103). The identification of the long-lived (T(1/2) = 1.0(-0.4)(+1.9) h) α-emitter (270)Db marks an important step towards the observation of even more long-lived nuclei of superheavy elements located on an "island of stability."

Published
2014

29. 48Ca+249Bk Fusion Reaction Leading to Element Z = 117: Long-Lived alpha-Decaying 270Db and Discovery of 266Lr

Author

Hübner, A., Yakusheva, V., Forsberg, U., Rudolph, D., Kurz, N., Ackermann, D., Tereshatov, E. E., Omtvedt, J. P., Herzberg, R.-D., Steinegger, P., Hartmann, W., Golubev, P., Tinschert, K., Runke, J., Wegrzecki, M., Eberhardt, K., Schausten, B., Block, M., Laatiaoui, M., Even, J., Asai, M., Semchenkov, A., Maiti, M., Gharibyan, N., Mistry, A., Miernik, K., Pang, G. K., Gregorich, K. E., Nitsche, H., Hoffmann, J., Düllmann, Ch. E., Steiner, J., Di Nitto, A., Khuyagbaatar, J., Trautmann, N., Krier, J., Brand, H., Derkx, X., Yakushev, A., Thörle-Pospiech, P., Jäger, E., Hamilton, J. H., Roberto, J., Van Cleve, S. M., Schädel, M., Shaughnessy, D. A., Torres De Heidenreich, T., Lahiri, S., Heßberger, F. P., Papadakis, P., Minami, S., Mokry, C., Renisch, D., Kindler, B., Hinde, D. J., Fahlander, C., Evers, M., Türler, Andreas, Uusitalo, J., Ward, D. E., Kratz, J. V., Andersson, L.-L., Cox, D. M., Wiehl, N., Boll, R. A., Hollinger, R., Lang, R., Gates, J. M., Dasgupta, M., Rykaczewski, K. P., Sarmiento, L. G., and Lommel, B.

Subjects
540 Chemistry, 570 Life sciences, biology
Published
2014
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30. Study of the $^{48}Ca + ^{249}Bk$ fusion reaction leading to element $Z = 117$: long-lived $\alpha$-decaying $^{270}Db$ and discovery of $^{266}Lr$

Author

Khuyagbaatar, J., Yakushev, A., Düllmann, C. E., Ackermann, D., Andersson, L.-L., Asai, M., Block, M., Boll, R. A., Brand, H., Cox, D. M., Dasgupta, M., Derkx, X., Di Nitto, A., Eberhardt, K., Even, J., Evers, M., Fahlander, C., Forsberg, U., Gates, J. M., Gharibyan, N., Golubev, P., Gregorich, K. E., Hamilton, J. H., Hartmann, W., Herzberg, R.-D., Heßberger, F., Hinde, D. J., Hoffmann, J., Hollinger, R., Hübner, A., Jäger, E., Kindler, B., Kratz, J. V., Krier, J., Kurz, N., Laatiaoui, M., Lahiri, S., Lang, R., Lommel, B., Maiti, M., Miernik, K., Minami, S., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Pang, G. K., Papadakis, P., Renisch, D., Roberto, J., Rudolph, D., Runke, J., Rykaczewski, K., Sarmiento, L. G., Schädel, M., Schausten, B., Semchenkov, A., Shaughnessy, D. A., Steinegger, P., Steiner, J., Tereshatov, E. E., Thörle-Pospiech, P., Tinschert, K., Torres De Heidenreich, T., Trautmann, N., Türler, A., Uusitalo, J., Ward, D. E., Wegrzecki, M., Wiehl, N., Van Cleve, S. M., and Yakusheva, V.

Subjects
Physics
Abstract

GSI Scientific Report 2013 - GSI Report 2014-1

Published
2014

31. 超重元素RfとDbの水溶液化学

Author

Nagame, Yuichiro, Kratz, J. V., and Sch\\\'adel, M.

Abstract

Recent studies of the chemical separation and characterization experiments of superheavy elements, rutherfordium (Rf) and dubnium (Db), conducted atom-at-a-time in aqueous phases, are reviewed. A short description on experimental techniques based on partition methods, specifically automated rapid chemical separation systems, is also given. A newly developed experimental approach to investigate single atoms of the heaviest elements with an electrochemical method is introduced. Perspectives for aqueous-phase chemistry experiments on heavier elements are briefly discussed.

Published
2016

32. Measurement of the dipole polarizability of the unstable neutron-rich nucleus 68Ni

Author

Rossi, D. M., Adrich, P., Aksouh, F., Alvarez-Pol, H., Aumann, T., Benlliure, J., Böhmer, M., Boretzky, K., Casarejos, E., Chartier, M., Chatillon, A., Cortina-Gil, D., Datta Pramanik, U., Emling, H., Ershova, O., Fernandez-Dominguez, B., Geissel, H., Gorska, M., Heil, M., Johansson, H. T., Junghans, A., Kelic-Heil, A., Kiselev, O., Klimkiewicz, A., Kratz, J. V., Krücken, R., Kurz, N., Labiche, M., Le Bleis, T., Lemmon, R., Litvinov, Y. A., Mahata, K., Maierbeck, P., Movsesyan, A., Nilsson, T., Nociforo, C., Palit, R., Paschalis, S., Plag, R., Reifarth, R., Savran, D., Scheit, H., Simon, H., Sümmerer, K., Wagner, A., Walus, W., Weick, H., and Winkler, M.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, dipole polarizability neutron skin, inverse kinematics invariant mass GDR PDR, Nuclear Experiment, strength distribution 68Ni Coulomb excitation
Abstract

The E1 strength distribution in 68Ni has been investigated using Coulomb excitation in inverse kinematics at the R3B-LAND setup and by measuring the invariant mass in the one- and two-neutron decay channels. The giant dipole resonance and a low-lying peak (pygmy dipole resonance) have been observed at 17.1(2) and 9.55(17) MeV, respectively. The measured dipole polarizability is compared to relativistic random phase approximation calculations yielding a neutron-skin thickness of 0.17(2) fm. A method and analysis applicable to neutron-rich nuclei has been developed, allowing for a precise determination of neutron skins in nuclei as a function of neutron excess.

Published
2013

33. Chemistry for Isobar Separation behind SHIP

Author

Even, J., Ackermann, D., Lommel, B., Hessberger, Fritz-Peter, Maurer, J., Steiner, J., Traut, T., Wiehl, N., Yakushev, A., Block, M., Brand, H., Düllmann, C. E., Jäger, E., Khuyagbaatar, J., Kindler, B., Kratz, J. V., and Krier, J.

Published
2013

34. Measurement of the Direct Neutron Decay of $^{68}$Ni

Author

Rossi, D. M., Adrich, P., Chatillon, A., Cortina-Gil, D., Datta Pramanik, U., Emling, H., Ershova, O., Fernandez-Dominguez, B., Geissel, H., Gorska, M., Heil, M., Johansson, H., Aksouh, F., Junghans, A., Kiselev, O., Klimkiewicz, A., Kratz, J. V., Kurz, N., Labiche, M., Le Bleis, T., Lemmon, R., Litvinov, Y. A., Mahata, K., Alvarez-Pol, H., Maierbeck, P., Movsesyan, A., Nilsson, T., Nociforo, C., Palit, R., Paschalis, S., Plag, R., Reifarth, R., Simon, H., Sümmerer, K., Aumann, T., Wagner, A., Weick, H., Winkler, M., Walus, W., Benlliure, J., Boehmer, M., Boretzky, K., Casarejos, E., and Chartier, M.

Published
2013

35. The Superheavy Element Search Campaigns at TASCA

Author

Khuyagbaatar, J., Yakushev, A., Düllmann, C. E., Nitsche, H., Roberto, J., Ackermann, D., L Andersson, L., Asai, M., Brand, H., Block, M., Cox, D. M., Dasgupta, M., Derkx, X., Di Nitto, A., Dvorak, J., Eberhardt, K., Ellison, P. A., Esker, N. E., Even, J., Evers, M., Claes Fahlander, Ulrika Forsberg, Gates, J. M., Gharibyan, N., Gregorich, K. E., Pavel Golubev, Gothe, O., Hamilton, J. H., Hinde, D. J., Willi Hartmann, D Herzberg, R., Fritz-Peter Hessberger, Hoffmann, J., Hollinger, R., Hübner, A., Jäger, E., Jeppsson, J., Kindler, B., Klein, S., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lahiri, S., Lommel, B., Maiti, M., Miernik, K., Minami, S., Mistry, A., Mokry, C., Omtvedt, J. P., Pang, G. K., Papadakis, P., Pysmenetska, I., Renisch, D., Dirk Rudolph, Runke, J., Rykaczewski, K., Luis Sarmiento, Schädel, M., Schausten, B., Shaughnessy, D. A., Semchenkov, A., Steiner, J., Steinegger, P., Thörle-Pospiech, P., Tereshatov, E. E., Torres Heidenreich, T., Trautmann, N., Türler, A., Uusitalo, J., Daniel Ward, Wiehl, N., Wegrzecki, M., and Yakusheva, V.

Published
2013

36. Measurement of the 92,93,94,100Mo(g,n) reactions by Coulomb Dissociation

Author

Göbel, K., Adrich, P., Altstadt, S., Alvarez-Pol, H., Aksouh, F., Aumann, T., Babilon, M., Behr, K. H., Benlliure, J., Berg, T., Böhmer, M., Boretzky, K., Brünle, A., Beyer, R., Casarejos, E., Chartier, M., Cortina-Gil, D., Chatillon, A., Pramanik, U. Datta, Deveaux, L., Elvers, M., Elze, T. W., Emling, H., Erhard, M., Ershova, E., Fernandez-Dominguez, B., Geissel, H., Górska, M., Heftrich, T., Heil, M., Hellstroem, M., Ickert, G., Johansson, H., Junghans, A. R., Käppeler, F., Kiselev, O., Klimkiewicz, A., Kratz, J. V., Kulessa, R., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindenberg, K., Litvinov, Y. A., Maierbeck, P., Movsesyan, A., Müller, S., Nilsson, T., Nociforo, C., Paar, N., Palit, R., Paschalis, S., Plag, R., Prokopowicz, W., Reifarth, R., Rossi, D. M., Schnorrenberger, L., Simon, H., Sonnabend, K., Sümmerer, K., Surówka, G., Vretenar, D., Wagner, A., Walter, S., Waluś, W., Wamers, F., Weick, H., Weigand, M., Winckler, N., Winkler, M., and Zilges, A.

Subjects
Nuclear Theory (nucl-th), Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Astrophysics - Instrumentation and Methods for Astrophysics, Nuclear Experiment, Instrumentation and Methods for Astrophysics (astro-ph.IM)
Abstract

The Coulomb Dissociation (CD) cross sections of the stable isotopes 92,94,100Mo and of the unstable isotope 93Mo were measured at the LAND/R3B setup at GSI Helmholtzzentrum f\"ur Schwerionenforschung in Darmstadt, Germany. Experimental data on these isotopes may help to explain the problem of the underproduction of 92,94Mo and 96,98Ru in the models of p-process nucleosynthesis. The CD cross sections obtained for the stable Mo isotopes are in good agreement with experiments performed with real photons, thus validating the method of Coulomb Dissociation. The result for the reaction 93Mo(g,n) is especially important since the corresponding cross section has not been measured before. A preliminary integral Coulomb Dissociation cross section of the 94Mo(g,n) reaction is presented. Further analysis will complete the experimental database for the (g,n) production chain of the p-isotopes of molybdenum., Comment: Talk given at the Conference Nuclear Physice in Astrophysics VI (NPA6), Lisbon, Portugal, May 19-24 2013. To appear in the NPA6 Proceedings in Journal of Physics: Conference Series (JPCS). 6 pages, 6 figures

Published
2013
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37. Superheavy Element Flerovium is the Heaviest Volatile Metal

Author

Yakushev, A., Gates, J. M., Gorshkov, A., Graeger, R., Ackermann, D., Block, M., Brüchle, W., Düllmann, C. E., Essel, H. G., Fritz-Peter Hessberger, Hübner, A., Jäger, E., Khuyagbaatar, J., Kindler, B., Krier, J., Kurz, N., Lommel, B., Schädel, M., Schausten, B., Schimpf, E., Eberhardt, K., Eibach, M., Even, J., Hild, D., Kratz, J. V., Niewisch, L. J., Runke, J., Thörle-Pospiech, P., Wiehl, N., Dvorak, J., Nitsche, H., Omtvedt, J. P., Semchenkov, A., Ulrika Forsberg, Dirk Rudolph, Uusitalo, J., L Andersson, L., D Herzberg, R., Parr, E., Qin, Z., and Wegrzecki, M.

Published
2013

38. The reactions $^{50}$Ti+$^{206,208}$Pb studied at TASCA

Author

Khuyagbaatar, J., Yakushev, A., Kindler, B., Kratz, J. V., Krier, J., Kurz, N., Lommel, B., Omtvedt, J. P., Runke, J., Schädel, M., Schausten, B., Steiner, J., Ackermann, D., Türler, A., Wiehl, N., Yakusheva, V., Uusitalo, J., Andersson, L.-L., Block, M., Düllmann, C. E., Even, J., Hessberger, Fritz-Peter, Hübner, A., and Jäger, E.

Published
2013

39. Carbonyl Complex Formation of Short-Lived Ir and Re Isotopes

Author

Even, J., Yakushev, A., Krier, J., Niewisch, L., Nitsche, H., Pysmenetska, I., Schädel, M., Schausten, B., Türler, A., Wiehl, N., Wittwer, D., Düllmann, C. E., Dvorak, J., Eichler, R., Gothe, O., Hild, D., Jäger, E., Khuyagbaatar, J., and Kratz, J. V.

Published
2013

40. First Superheavy Element Experiments at the GSI Recoil Separator TASCA: The Production and Decay of Element 114 in the 244Pu(48Ca,3-4n) Reaction

Author

Gates, J. M., Duellmann, Ch E., Schaedel, M., Yakushev, A., Tuerler, A., Eberhardt, K., Kratz, J. V., Ackermann, D., Andersson, L. -L., Block, M., Bruechle, W., Dvorak, J., Essel, H. G., Ellison, P. A., Even, J., Forsberg, Ulrika, Gellanki, Jnaneswari, Gorshkov, A., Graeger, R., Gregorich, K. E., Hartmann, W., Herzberg, R. -D., Hessberger, F. P., Hild, D., Huebner, A., Jaeger, E., Khuyagbaatar, J., Kindler, B., Krier, J., Kurz, N., Lahiri, S., Liebe, D., Lommel, B., Maiti, M., Nitsche, H., Omtvedt, J. P., Parr, E., Rudolph, Dirk, Runke, J., Schaffner, H., Schausten, B., Schimpf, E., Semchenkov, A., Steiner, J., Thoerle-Pospiech, P., Uusitalo, J., Wegrzecki, M., and Wiehl, N.

Subjects
Subatomic Physics
Abstract

Experiments with the new recoil separator, Transactinide Separator and Chemistry Apparatus (TASCA), at the GSI were performed by using beams of Ca-48 to irradiate targets of Pb206-208, which led to the production of No252-254 isotopes. These studies allowed for evaluation of the performance of TASCA when coupled to a new detector and electronics system. By following these studies, the isotopes of element 114 ((288-291)114) were produced in irradiations of Pu-244 targets with Ca-48 beams at compound nucleus excitation energies around 41.7 and 37.5 MeV, demonstrating TASCA's ability to perform experiments with picobarn-level cross sections. A total of 15 decay chains were observed and were assigned to the decay of 288-291114. A new a-decay branch in (281)Ds was observed, leading to the new nucleus (277)Hs.

Published
2011

41. NeuLAND: MRPC-based time-of-flight detector for 1 GeV neutrons

Author

Bemmerer, D., Elekes, Z., Kempe, M., Stach, D., Wagner, A., Yakorev, D., Aumann, T., Boretzky, K., Caesar, C., Ciobanu, M., Hehner, J., Heil, M., Nusair, O., Reifarth, R., Simon, H., Rossi, D., Kratz, J. V., Elvers, M., Maroussov, V., and Zilges, A.

Abstract

The NeuLAND detector at the R$^3$B experiment at the future FAIR facility in Darmstadt aims to detect fast neutrons (0.2-1.0\,GeV) with high time and spatial resolutions ($\sigma_{\rm t}$$

Published
2010

42. Collective dipole excitations in neutron-rich nuclei from Sn-132 mass region, the nuclear symmetry energy and neutron skins

Author

Klimkiewicz, A., Paar, Nils, Adrich, P., Fallot, M., Boretzky, K., Aumann, T., Cortina-Gil, D., Pramanik, U. D., Elze, T. W., Emling, H., Geissel, H., Hellstrom, M., Jones, K. L., Kratz, J. V., Kulessa, R., Nociforo, C., Palit, R., Simon, H., Surowka, G., Summerer, K., Vretenar, Dario, and Walus, W.

Subjects
Nuclear Theory, Nuclear Experiment, symmetry energy, pygmy resonances, dipole excitations
Abstract

Dipole strength distributions measured in unstable neutron-rich nuclei in the Sn-132 mass region by utilizing relativistic Coulomb excitation of radioactive beams reveal a sizable fraction of "pygmy" strength below the giant dipole resonance. On the grounds of the RQRPA model, a strong linear correlation between the pygmy strength, parameters of the nuclear symmetry energy and the neutron skin thickness has been found. From the experimentally observed low-lying strength, the symmetry energy pressure p(0) = 2.3 +/- 0.8 MeV/fm(3) and neutron skin thicknesses of 0.23 +/- 0.04 fm Sn-130 and 0.24 +/- 0.04 fm Sn-130 have been extracted.

Published
2009

43. Studies on multigap resistive plate chamber prototypes for the new NeuLAND detector at the R3B experiment at FAIR

Author

Elvers, M., Aumann, T., Bemmerer, D., Boretzky, K., Endres, J., Hehner, J., Heil, M., Kratz, J. V., Prokopowicz, W., Reifarth, R., Rossi, D., Schrieder, G., Stach, D., Wagner, A., Yakorev, D., and Zilges, A.

Subjects
cosmic rays, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, NeuLAND, MRPC, neutron detector, Multigap resistive plate chambers, R3B
Abstract

The NeuLAND detector is part of the R3B experiment at FAIR and will detect neutrons between 0.2 and 1 GeV. The high energy neutrons are converted to charged particles, mainly protons, which are detected by Multigap Resistive Plate Chambers (MRPC). For the detector, a time resolution of σt < 100 ps and a position resolution of σx,y,z ≈ 1 cm is required for given flight paths in the range from 10 to 35 m. An active area of 2 × 2 m2 of the neutron detector at a distance of 12.5 m to the target will match the angular acceptance of ±80 mrad for the neutrons defined by the gap of the superconducting dipole magnet. The salient features of the prototypes will be described, as well as electrical measurements and studies with cosmic rays.

Published
2009

44. Pygmy Dipole Strength in Exotic Nuclei and the Equation of State

Author

Klimkiewicz, A., Paar, N., Adrich, P., Fallot, M., Le Bleis, T., Rossi, D., Boretzky, K., Aumann, T., Alvarez-Pol, H., Aksouh, F., Benlliure, J., Berg, T., Boehmer, M., Casarejos, E., Chartier, M., Chatillon, A., Cortina-Gil, D., Pramanik, U. D., Elze, T. W., Emling, H., Ershova, O., Fernando-Dominguez, B., Geissel, H., Gorska, A., Heil, M., Hellstrom, M., Johansson, H., Jones, K. L., Junghans, A., Kiselev, O., Kratz, J. V., Kulessa, R., Kurz, N., Labiche, M., Lemmon, R., Litvinov, Y., Mahata, K., Maierbeck, P., Nilsson, T., Nociforo, C., Palit, R., Paschalis, S., Plag, R., Reifarth, R., Simon, H., Summerer, K., Surowka, G., Vretenar, D., Andreas Wagner, Walus, W., Weick, H., Winkler, M., and Matko Milin, Tamara Niksic, Suzana Szilner, Dario Vretenar

Subjects
symmetry energy, ion beams, coulomb excitation, neutron skin, Nuclear Experiment
Abstract

A concentration of dipole strength at energies below the giant dipole resonance was observed in neutron-rich nuclei around 132Sn in an experiment using the FRS-LAND setup. This so-called “pygmy” dipole strength can be related to the parameters of the symmetry energy and to the neutron skin thickness on the grounds of a relativistic quasiparticle random-phase approximation. Using this ansatz and the experimental findings for 130Sn and 132Sn, we derive a value of the symmetry energy pressure of p-bar0 = 2.2±0.5 MeV/fm3. Neutron skin thicknesses of Rn−Rp = 0.23±0.03 fm and 0.24±0.03 fm for 130Sn and 132Sn, respectively, have been determined. Preliminary results on 68Ni from a similar experiment using an improved setup indicate an enhanced cross section at low energies, while the results for 58Ni are in accordance with results from photoabsorption measurements.

Published
2009

45. An Improved Neutron Electric Dipole Moment Experiment

Author

Bodek, K., Kistryn, St, Kuzniak, M., Zejma, J., Burghoff, M., Knappe-Gruneberg, S., Sander-Thoemmes, T., Schnabel, A., Trahms, L., Ban, G., Lefort, T., Naviliat-Cuncic, O., Khomutov, N., Knowles, P., Pazgalev, A. S., Weis, A., Rogel, G., Quemener, G., Rebreyend, D., Roccia, S., Tur, M., Bison, G., Severijns, N., Eberhardt, K., Hampel, G., Heil, W., Kratz, J. V., Lauer, T., Plonka-Spehr, C., Sobolev, Yu, Wiehl, N., Altarev, I., Fierlinger, P., Gutsmiedl, E., Stephan Paul, Stoepler, R., Daum, M., Henneck, R., Kirch, K., Knecht, A., Lauss, B., Mtchedlishvili, A., Petzold, G., Zsigmond, G., Vernay, Emmanuelle, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), and ILL

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

A new measurement of the neutron EDM, using Ramsey's method of separated oscillatory fields, is in preparation at the new high intensity source of ultra-cold neutrons (UCN) at the Paul Scherrer Institute, Villigen, Switzerland (PSI). The existence of a non-zero nEDM would violate both parity and time reversal symmetry and, given the CPT theorem, might lead to a discovery of new CP violating mechanisms. Already the current upper limit for the nEDM (|d_n, Flavor Physics & CP Violation Conference, Taipei, 2008

Published
2008

46. The t + n + n System and 5H

Author

Meister, M., Chulkov, L. V., Simon, H., Aumann, T., Borge, M. J. G., Elze, Th W., Emling, H., Geissel, H., Hellström, M., Jonson, B., Kratz, J. V., Kulessa, R., Leifels, Y., Markenroth, K., Münzenberg, G., Nickel, F., Nilsson, T., Nyman, G., Pribora, V., Richter, A., Riisager, K., Scheidenberger, C., Schrieder, G., Olof Tengblad, and Zhukov, M. V.

Abstract

Investigation of one-proton knockout channel from 6He impinging on a carbon target was performed. The triton fragments originating from this channel were detected in coincidence with the two neutrons. A broad structure was observed in the t + n + n-relative energy spectrum. The observed structure cannot be attributed to background process.

Published
2003

47. The t+n+n system and H-5

Author

Meister, M., Chulkov, L. V., Simon, H., Aumann, T., García Borge, María José, Elze, Th. W., Emling, H., Geissel, H., Hellström, M., Jonson, B., Kratz, J. V., Kulessa, R., Leifels, Y., Markenroth, K., Münzenberg, G., Nickel, F., Nilsson, T., Nyman, G., Pribora, V., Richter, Achim W., Riisager, K., Scheidenberger, C., Schrieder, G., Tengblad, Olof, and Zhukov, M. V.

Subjects
A ≤ 5 [[PACS]Properties of specific nuclei listed by mass ranges], [PACS]Breakup and momentum distributions, [PACS]Single-particle levels and strength functions, [PACS]Properties of specific nuclei listed by mass ranges: A ≤ 5
Abstract

4 pages, 1 table, 3 figures.--PACS nrs.: 27.10.+h; 21.10.Pc; 25.60.Gc, The one-proton knockout channel from He-6 (240 MeV/u) impinging on a carbon target has been investigated. The triton fragments originating from this channel were detected in coincidence with the two neutrons. A broad structure, peaked at 3 MeV above the t+2n threshold, is observed in the t+n+n-relative energy spectrum. It is shown that this structure is mainly due to a I-pi=1/2(+) resonance as expected for the H-5 ground state, and from the observed angular and energy correlations, being used for the first time in H-5 studies, that the neutrons to a large extent occupy the p shell., This work was supported by the BMBF under Contracts No. 06 DA 925 I, No. 06 OF 838, and No. 06 MZ 864 I, and by GSI via Hochschulzusammenarbeitsvereinbarungen under Contracts No. DARIC, No. OF ELZ, No. MZ KRAK, and partly supported by the Polish Committee of Scientific Research under Contract No. KBN/2P03B/144/10, CICYT under Contract No. AEN99-1046-C02-02 (M. J.G. B., O.T.), RFBR under Contract No. 01-02-16685, and EC under Contract No. ERBCHGE-CT92-0003. One of us (B. J.) acknowledges support from the Alexander von Humboldt Research Foundation.

Published
2003

48. Two-phonon giant resonances in sup 1 sup 3 sup 6 Xe, sup 2 sup 0 sup 8 Pb, and sup 2 sup 3 sup 8 U

Author

Boretzky, K, Adrich, P, Aumann, T, Bertulani, C A, Cub, J, Dostal, W, Eberlein, B, Elze, T W, Emling, H, Fallot, M, Grünschloss, A, Holeczek, J, Holzmann, R, Ilievski, S, Kozhuharov, C, Kratz, J V, Kulessa, R, Leifels, Y, Leistenschneider, A, Lubkiewicz, E, Mordechai, S, Ohtsuki, T, Reiter, P, Simon, H, Stelzer, K, Stroth, J, Sümmerer, K, Surowiec, A, Wajda, E, and Walús, W

Subjects
Nuclear Experiment, Nuclear Physics
Abstract

The excitation of the double-phonon giant dipole resonance was observed in heavy projectile nuclei impinging on targets of high nuclear charge with energies of 500-700 MeV/nucleon. New experimental data are presented for sup 1 sup 3 sup 6 Xe and sup 2 sup 3 sup 8 U together with further analysis of earlier data on sup 2 sup 0 sup 8 Pb. Differential cross sections d sigma/dE sup * and d sigma/d theta for electromagnetic excitations were deduced. Depending on the isotope, cross sections appear to be enhanced in comparison to those expected from a purely harmonic nuclear dipole response. The cumulative effect of excitations of two-phonon states composed of one dipole and one quadrupole phonon, of predicted anharmoniticies in the double-phonon dipole response, and of damping of the dipole resonance during the collision may account for the discrepancy. In addition, decay properties of two-phonon resonances were studied and compared to that of a statistical decay.

Published
2003

49. Searching for the sup 5 H resonance for the t+n+n system

Author

Meister, M, Aumann, T, García-Borge, M J, Chulkov, L V, Elze, T W, Emling, H, Geissel, H, Hellström, M, Jonson, B, Kratz, J V, Kulessa, R, Leifels, Y, Markenroth, K G, Münzenberg, G, Nickel, F, Nilsson, T, Nyman, G H, Pribora, V N, Richter, A, Riisager, K, Scheidenberger, C, Schrieder, G, Simon, H, and Tengblad, O

Subjects
Nuclear Theory, Nuclear Experiment, Nuclear Physics
Abstract

The unbound hydrogen isotopes sup 4 sup , sup 5 H have been studied in the one-proton knockout channel of sup 6 He (240 MeV/u) impinging on a carbon target. The triton fragments originating from this channel were detected in coincidence with neutrons. Relative energy spectra as well as energy and angular correlations have been studied for the t+n and t+n+n systems. The analysis of the energy and angular correlations by the method of hyperspherical harmonic expansion allows to determine the relative weights of the most relevant partial waves in the three-body t+n+n final state. It is shown that the neutrons to a large extent occupy the p-shell and that the I suppi = 1/2 sup + state is strongly populated as expected for the sup 5 H ground state. No evidence for a narrow resonance in the t+n+n system is obtained, instead a broad structure peaked at 3 MeV above the threshold with about 6 MeV as a full width at half maximum is observed. The two-body t+n system reveals a resonance compatible with earlier results for sup 4 H.

Published
2003

50. The [formula presented] system and [formula presented]

Author

Meister, M., Chulkov, L. V., Simon, H., Aumann, T., Borge, M. J.G., Elze, Th W., Emling, H., Geissel, H., Hellström, M., Jonson, B., Kratz, J. V., Kulessa, R., Leifels, Y., Markenroth, K., Münzenberg, G., Nickel, F., Nilsson, T., Nyman, G., Pribora, V., Richter, A., Riisager, K., Scheidenberger, C., Schrieder, G., Tengblad, O., and Zhukov, M. V.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

The one-proton knockout channel from [Formula presented] ([Formula presented]) impinging on a carbon target has been investigated. The triton fragments originating from this channel were detected in coincidence with the two neutrons. A broad structure, peaked at 3 MeV above the [Formula presented] threshold, is observed in the [Formula presented]-relative energy spectrum. It is shown that this structure is mainly due to a [Formula presented] resonance as expected for the [Formula presented] ground state, and from the observed angular and energy correlations, being used for the first time in [Formula presented] studies, that the neutrons to a large extent occupy the [Formula presented] shell.

Published
2003

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